Mold for producing interlocked slider bodies and pull for slide fasteners



o. CHEU MANN EIAL 5 mow F0 onuc NTERLOCKED SLIDER BODIES FASTE D PUL 0R SLIDE NERS Filed Feb. 7, 1946 3 Sheets-Sheet l VENTOR. one 6. s zrmann y PAUL. NATZLER I ATTORNEY-5 8 2 -m d R w ER R V E o 5., w mma w A 2 M S N 3 a RS w l D O P LEW E H F y. 8

MN ET A BLOCKED S IDE FASTE RMA INTE R SL SCHEUE PRODUCI AND FULL O. MOLD BODIES Filed Feb. 7, 1946 3m, 39% o. G. SCHEUERMANN ETAL fifi w MOLD FOR PRODUCING INTERLOCKED SLIDER BODIES AND FULL FOR SLIDE FASTENERS 3 Sheets-Sheet 3 Filed Feb. 7, 1946 FREE INVENTORH ()Tib 6. Schauarmqnn BY PAUL NATZLER MM ATTORNEYS Patented May 30, 1950 nrrso OFFICE MOLD FOR PRODUCING INTERLOGKED SLIDER BODIES AND FULL FOR SLIDE FASTENERS Application February 7, 1945, Serial No. 646,103

14 Claims. 1

This invention relates to slide fasteners, especially sliders, and more particularly to apparatus for molding or die-casting the same.

A slider of the usual type comprises a slider body and a pull tab or pull pivotally mounted thereon. Heretofore, the slider body and the pull have been made separately and later joined. This required a bending of the parts, if of metal, and a bending and cementing, if of plastic. One object of the present invention is to do away with these assembly operations.

Another object is to provide a mold which furnishes a joined slider body and pull having the increased strength which arises from making the slider body a closed integral structure, and the pull a closed integral structure.

One method of accomplishing the foregoing objects is disclosed in our companion application Serial No. 646,102, filed on even date herewith. In that method, however, the slider lug and pull are somewhat modified in shape, being made of special configuration to facilitate the combined molding operation. Moreover, the die requires four retractable cores. Further and more specific objects of the present invention are to simplify the aforesaid method, first, in not necessitating a special configuration for the slider lug and pull, and second, in requiring only two retractable cores.

To accomplish the foregoing objects, and others which will hereinafter appear, our invention resides in the mold elements, and their relation one to the other, as are more particularly described in the following specification, and sought to be defined in the appended claims. The specification is accompanied by drawings in which:

Fig. 1 is a plan view of the slider body and pull with the parts in the relative position in which they are molded;

Fig. 2 is a side elevation of the same;

Figs. 3, 4, 5, 6, 7 and 8 are fragmentary horizontal sections taken respectively in the planes of the lines 3-3, E4, 55, 6-6, 'll and 88, of Fig. 2;

Fig. 9 is a perspective view explanatory of the invention;

Fig. 10 is a horizontal section showing the shape of the mold within the slider body; and

Fig. 11 is a partial plan view of the mold showing the cores moved with one of the dies away from the other die when the mold is opened.

Referring to the drawings, and more particularly to Figs. 1 and 2, the slider body B may be conventional, and comprises a front wall or wing 12, and a rear wall or wing 14, joined by a strut or neck 66. The wings l2 and It have inwardly turned flanges it which, together with the neck 56, define a Y-shaped channel through which the stringers of the slide fastener pass. The front wing 52 carries a lug L, to which a pull tab T (usually called simply a pull) is pivotally connected. The lug L comprises posts 20 and 22 joined by a rail 24. The pull T comprises a handle portion 25, and spaced arms 28 and 30 joined by a pivot pin 32. In accordance with the present invention, the slider body, the posts 2t and 22 and the rail 2d, are cast as an integral, closed structure, and similarly, the pull handle 25, the arms 28 and Fill, and the pivot pin 32, are cast as an integral, closed structure, these parts being molded simultaneously in joined relation.

The pull T would usually lie in the broken-line position shown at T, but is drawn in solid lines in the position in which it is molded. It will be noted that this position is not only erect relative to the slider body, but that the pull has been turned at an angle about its longitudinal axis. This is an important feature of the invention, and, referring to Fig. 1, it may be pointed out that the angle of the pull is such that the arm 28 is disposed on one side of a plane 34, and that the arm Sil is disposed on the other side of plane 34, said plane 34 extending transversely of the rail 24. As will be explained later, this makes it possible to mold the piece with only two retractable cores.

The mold, insofar as it is used to form the slider body itself, is of the class disclosed in a copending application of Frederick Ulrich, Serial No. 512,898, filed December l, 1943, since issued as Patent No. 2,415,395. Referring to Fig. 10, such a mold separates on parting face P extending transversely of the slider at its widest point, thus making is possible to mold the inside Y-shaped channel of the slider while using only fixed cores. In the present case, the cover die til has fixed core portions 42 and M, and the ejector die has a core portion G8. The core portions 42, M, and :23 fit together to define the slider channel, and also the neck [6 of the slider.

Referring now to Fig. 9, the ejector die has been omitted, but a fragmentary upper portion of the cover die it is shown. This figure shows how the handle portion 2E5 of the pull when in erect position, is readily molded by cavities in the parting face P of the die. Two oppositely movable cores 5% and 52 extend transversely of the rail 2%, and may be moved into lapped relation intermediate the upper cavities which form the pull, and the lower cavities which form the slider body, the said cores helping to form the lug and pivot pin in joined relation.

The die is next described in greater detail, with reference to Figs. 3 through 8 showing sections taken at successive levels through the die.

The section of Fig. 3 is taken through the handle portion of the pull. The cover die 49 has a cavity and the ejector die (i6 has a cavity 55, said cavities together forming the pull handle, which in this case is rectangular in crosssection. The parting face P at one side of the die is displaced from that at the other side of the die, so that the corners of the pull lie in the parting face. The gate passage for supplying molten metal or a plastic molding composition to the cavity is indicated at 96. The gate 96 and cavity 5 5 are both shown in difierent aspect in Fig. 9, which may be referred to at this point.

The section of Fig. 4 is taken through the arms 28 and as of the pull, above the lug. For this purpose, the cover die iii is provided with a projection or fixed core portion 58, and the ejector die 46 is provided with a projection or fixed core portion 553. The parts 58 and 6GB come together to define spaced cavities 23 and for the arms 28 and 3E3. In Fig. 9, the core projection 58 is shown in perspective.

The section of Fig. 5 is taken through the rail 2:; of the lug. The cover die dd has a cavity 62 which helps form one end of the rail 2d, and the ejector die d6 has an aligned cavity which helps form the other end of the rail. The cavities 28' and 39 for the arms 28 and 39 are also shown. The cavity 62 in cover die is indicated also in Fig. 9, as well as the extension 66 thereof which defines the outside of the post 22. This is further indicated in Fig. 5 by the broken lines 66 and 88, for the posts 22 and Eli respectively.

As so far described, the die structure requires only fixed cores on separable mold halves. The sectional views next described include the retractable cores.

The section shown in Fig. 6 is taken through the uppermost portions of the cores which define the space or clearance between the pivot pin 32 of the pull and the rail 2'2. of the lug. In Fig. 6, the outer edge iii of core 5t defines the inside wall of the cavity 22' for the post 22. Similarly, the outer edge '52 of core 52 defines the inside wall of the cavity 29' for the post 2d.

The end walls i i and it of the core 59 define two sides of the cavity 30 for the pull arm 30, and the end walls it and 3E? of core 52 define two sides of the cavity 28 for the pull arm 28.

The cores 5i! and 52 come into lapped or sideby-side relation at surfaces 32 and 8 This explains the reason for the angular position of the pull during the molding operation, for the surfaces 82, 8% lie in and correspond to the transverse plane 34, as previously referred to in connection with Fig. 1. It was then stated that the angularity of the pull is such that the arm 28 lies on one side, and the arm 89 lies on the other side, of the transverse plane 34, 3d. If this were not the case, it would not be possible to retract the cores, andfitherefore it would not be possible to form the parts here under consideration by the use of only two slidable cores. The pull may be turned more than shown, but not less.

In Fig. 9, attention is directed to the end walls M and i6, and sliding surface 82, all on core 50, and corresponding to the similarly numbered parts in Fig. 6. The same applies to the end walls '18 and 8G, and the sliding surface 84, on core 52. It will be apparent that the Fig. 6 sec- 4 tion is taken through the triangular projections at the top of the cores, and that these projections define the space or clearance between the pivot pin 32 of the pull and the rail 24 of the lug.

The section of Fig. '7 is taken somewhat lower, and runs through the pivot pin 32 of the pull. As before, the outer walls l0 and 12 of cores 5!! and 52 define the inside walls of the posts 22 and 29, respectively. The sloping Walls it and 18 of cores 56 and 52 define the sides of the pivot pin 32. The surfaces 14 and 78 have already been referred to in connection with Fig. 9, and reverting to that figure, it will be understood that the Fig. 7 section is taken intermediate the top and bottom projections on the ends of the cores 5i] and 52.

The section of Fig. 8 is taken through the bottom projections on the cores, and here again the outer walls It and 12 of cores 5E and 52, respectively, define the inside walls of the posts 22 and 2E! of the lug. The surfaces 82 and 84 correspond to the similarly numbered surfaces in Fig. 6, and lie in the transverse plane 3d, 34 there referred to. The cores overlap and fit together as shown to form a continuous solid body which defines the space between the bottom of pivot pin 32 of the pull and the top of the slider body. Referring to Fig. 9, it will be understood that the Fig. 8 section is taken through the trapezoidal projections 36 and 88 at the bottom of the cores.

The core 59 is at least partially received in the mating passage indicated at 5| in Fig. 9. The core 52 is received in a passage in the ejector die, not shown. In accordance with conventional practice, the cores 59 and 52 may be and preferably are both mounted in the ejector die for movement therewith. In other words, the cores are so mounted in the movable mold section as to be slidable in a direction longitudinal of the cores, and movable with the movable mold section in a direction laterally of the cores. This helps insure extraction of the molded piece from the cover die by movement with the ejector die, and the cores 50 and 52 may be pulled outwardly during or following opening of the die, after which the molded piece may be ejected from the ejector die, the cores then having been retracted entirely from the molded piece. Fig. 11 illustrates the movement of the cores 5d and 52 with the ejector die d8 away from the cover die 48 when the mold is opened. The cores 5!) and 52 may be moved outwardly and apart after the mold has been opened, whereupon the molded slider comprising the pivotally connected slider body B and pull T may be ejected from the ejector die 46. This is another advantage of the present die over that shown in our companion application, for it is not necessary to mount movable cores in the cover die, and to provide mechanism for moving the same out of the casting before the die opens.

In Fig. 9, the gate passage for feeding molten metal or plastic to the pull cavity, is indicated at 9! As was mentioned and described in greater detail in our co-pending application Serial No. 646,102, previously referred to, separate gate passages are needed to feed metal to the slider body cavity. Such a passage is indicated at 92 in Fig. 10. The gate passages are, of course, joined at a point away from the mold cavities, and are fed from a common source.

The co-pending application previously referred to also shows the ejector pins for the slider body and the pull, these preferably being located at overflow or flash-points just outside the mold cavities. The ejector pins have been omitted in the present drawing in order to simplify the drawing, and because they may be located in accordance with known practice.

While we have referred to the die 40 as the cover die, and the die 45 as the ejector die, it will be understood. that this arrangement may be reversed. It will also be understood that the feature whereby the pull is turned about its longitudinal axis at an angle such that one arm lies on one side and the other arm lies on the other side of a plane extending transversely of the slider, may be used in combination with a die which forms the slider body itself in a manner different from that disclosed herein; that is, may be used in a die in which the parting face is not necessarily transverse of the slider body, with fixed cores to form the internal Y-shaped channel.

It will be understood that while we have shown and described our invention in a preferred form, changes may be made in the mold structure shown, without departing from the spirit of the invention, as sought to be defined in the following claims.

We claim:

1. A mold for molding a slider having a lug and a pull joined by a pivot pin, said mold having appropriate cavities to form the slider body and pull, and including two cores which come together in lapped relation intermediate the aforesaid slider and pull cavities tohelp form the lug and pivot pin in pivotally joined relation, said cores extending transversely of the longitudinal axis of the lug.

2. A mold for molding a slider having a lug made up of two posts joined by a rail, and a pull made up of a handle having two arms joined by a pivot pin passing through the lug, said mold having appropriate cavities to form the slider body and pull, and including two oppositely retractable cores coming together in lapped relation intermediate the aforesaid slider and pull cavities, said cores extending transversely of the longitudinal axis of the rail, the ends of said cores being so shaped as to help form the posts, rail, arms, and pivot pin.

3. A mold for molding a slider having a lug made up of two posts joined by a rail, and a pull made up of a handle having two arms joined by a pivot pin passing through the lug, said mold being separable on a parting face transverse to the longitudinal axis of the slider, and having appropriate cavities to form the slider body, and having appropriate cavities to form the pull handle, and said mold including two oppositely retractable cores coming together in lapped re lation intermediate the aforesaid slider body and pull handle cavities, said cores extending transversely of the longitudinal axis of the slider, and being so shaped as to help form the posts, rail, arms, and pivot pin.

4. A mold for molding a slider having a lug, and a pull made up of a handle having two arms joined by a pivot pin passing through the lug, said mold having appropriate cavities to form the slider body, and having cavities which help form the handle portion of the pull with the pull erect relative to the slider, said pull being turned about its longitudinal axis at an angle such that one arm of the pull lies on one side and the other arm of the pull lies on the other side of a plane extending transversely of the longitudinal axis of the lug, and a pair ofoppositely; movable cores extending transversely of the longitudinal axis of the lug and coming together in lapped relation intermediate the aforesaid slider body and pull cavities.

5. A mold for molding a slider having. a lug made up of two posts joined by a rail, and a pull made up of a handle having two arms joined by a pivot pin passing through the lug, said mold having appropriate cavities to form the slider body, and having cavities which help form the handle portion of the pull with the pull erect relative to the slider, said pull being turned about its longitudinal axis at an angle such that one arm of the pull lies on one side and the other arm of the pull lies on the other side of a plane extending transversely of the longitudinal axis of the rail, and a pair of oppositely movable cores extending transversely of the longitudinal axis of the rail and coming together in lapped relation intermediate the aforesaid slider body and pull cavities, said cores being so shaped as to help form the posts, the space between the pivot pin and th slider body, the space between the pivot pin and the rail, the pivot pin, and the arms of the pull.

6. A mold for molding a slider having a lug, and a pull made up of 'a handle having two arms joined by a pivot pin passing through the lug, the said mold being separable on a parting face extending transversely of the longitudinal axis of the slider and having appropriate cavities to form the slider body, and having cavities which help form the handle portion of the pull with the pull lying approximately in the parting face of the mold, said pull being turned about its longitudinal axis at an angle such that one arm of the pull lies on one side and the other arm of the pull lies on the other side of a plane extending transversely of the longitudinal axis of the slider, and a pair of oppositely movable cores extending transversely of the longitudinal axis of. the slider and coming together in lapped relation intermediate the aforesaid slider body and pull cavities.

'7. A mold. for molding a slider having a lug, and a pull made upof ahandle having twoarms joined by a pivot pin passing through the lug, said mold being separable on a partingface extending transversely of the longitudinal axis of the slider and-having appropriate cavities to form the slider body, the separable halves of the mold having fixed cores which help form a Y-shaped channel within the slider, and also having cavities which help form the handle portion of the pull with the pull lying approximately in the parting face of the mold, said pull being turned about its longitudinal axis at an angle such that one arm of the pull lies on one side and the other arm of the pull lies on the other side of a plane extending transversely of the longitudinal axis of the slider, and a pair of oppositely movable cores extending transversely of the longitudinal axis of the slider and coming together in lapped relation intermediate the aforesaid slider body and pull cavities.

8. A mold for molding aslider having a. lug made up of two posts joinedby a rail, and apull made up of a handle having two arms joined by a pivot pin passing through the lug, said mold be ing separable on a parting face extending transversely of the longitudinalaxis of the slider and having appropriate cavities to form the slider body, and also having cavities whichhelp-form the handle portion of the pull, said pull being turned about its longitudinal axis at an angle such that one arm of the pull lies on'one side and theoth er' arm of the pull lies on the other side of a plane extending transversely of the longitudinal axis of -the slider,-a pair of oppositely movable cores coming together in lapped relation intermediate the aforesaid slider body and pull cavities, said cores being so shaped as to help form the posts, the space between the pivot pin and the slider body, the space between the pivot pin and the rail, the pivot pin, and the arms of the pull.

9. A mold for molding a slider having a lug made up of two posts joined by a rail, and a pull made up of a handle having two arms joined by a pivot pin passing through the lug, said mold being separable on a partingface extending transversely of the longitudinal axis of the slider and having appropriate cavities to form the slider body, the separable halves of the mold having fixed cores which help form a Y-shaped channel Within the slider, and also having cavities which help form the handle portion of the pull with the pull lying approximately in the parting face of the mold, said pull being turned about its longitudinal axis at an angle such that one arm of the pull lies on one side and the other arm of the pull lies on the other side of a plane extending transversely of the longitudinal axis of the slider, a pair of oppositely movable cores extending transversely of the longitudinal axis of the slider and coming together in lapped relation intermediate the aforesaid slider body and pull cavities, said cores being so shaped as to help form the posts, the space between the pivot pin and the slider body, the space between the pivot pin and the rail, the pivot pin, and the arms of the pull.

10. A mold for molding a slider having a lug made up of two posts joined by a rail, and a pull made up of a handle having two arms joined by a pivot pin passing through the lug, said mold being separable on a parting face extending transversely of the longitudinal axis of the slider and having appropriate cavities to form the slider body, and also having cavities which help form the handle portion of the pull, said pull being turned about its longitudinal axis at an angle such that one arm of the pull lies on one side and the other arm of the pull lies on the other side of a plane extending transversely of the longitudinal axis of the slider, a pair of oppositely movable cores coming together in lapped relation intermediate the aforesaid slider body and pull cavities, the outer edges of said cores being so shaped as to form the inside walls of the posts, the lowermost portions of the cores being so shaped as to form the space between the pivot pin and the slider body, the uppermost portions of said cores being so shaped as to form the space between the pivot pin and the rail, the intermediate portions of said cores being so shaped as to form the pivot pin, and the ends of said cores being so shaped as to help form the arms of the pull.

11. A mold for molding a slider having a lug made up of two posts joined by a rail, and a pull made up of a handle having two arms joined by a pivot pin passing through the lug, said mold being separable on a parting face extending transversely of the longitudinal axis of the slider and having appropriate cavities to form the slider body, the separable halves of the mold having fixed cores which help form a Y-shaped channel within the slider body, and also having cavities which help form the handle portion of the pull with the pull lying approximately in the parting face of the mold, said pull being turned about its longitudinal axis at an angle such that one arm of the pull lies on one side and the other arm of the pull lies'on the other side of a plane extending transversely of the longitudinal axis or" the slider, a pair of oppositely movable cores extending transversely of the longitudinal axis of the slider and coming together in lapped relation intermediate the aforesaid slider body and pull cavities, the outer edges of said cores being so shaped as to form the inside walls of the posts, the lowermost portions of the cores being so shaped as to form the space between the pivot pin and the slider body, the uppermost portions of said cores being so shaped as to form the space between the pivot pin and the rail, the intermediate portions of said cores being so shaped as to form the pivot pin, and the ends of said cores being so shaped as to help form the arms of the pull.

12. A mold for molding a slider having a lug made up of two posts joined by a rail, and a pull made up of a handle having two arms joined by a pivot pin passing through the lug, said mold comprising a stationary mold section and a movable mold section, and having appropriate cavities to form the slider body and pull, and including two oppositely retractable cores which come together in lapped relation intermediate the aforesaid slider and pull cavities to help form the lug and pivot pin in pivotally joined relation, said cores extending transversely of the longitudinal axis of the rail, and being so mounted in the movable mold section as to be slidable in a direction longitudinal of the cores, and movable with the movable mold section in a direction laterally of the cores, the ends of said cores being so shaped as to help form the posts, rail, arms, and pivot pin.

13. A mold for molding a slider having a lug made up of two postsjoined by a rail, and a pull made up of a handle having two arms joined by a pivot pin passing through the lug, said mold comprising a stationary mold section and a movable mold section, and having appropriate cavities to form the slider body, and having cavities which help form the handle portion of the pull with the pull erect relative to the slider body, said pull being turned about its longitudinal axis at an angle such that one arm of the pull lies on one side and the other arm of the pull lies on the other side of a plane extending transversely of the longitudinal axis of the rail, and a pair of oppositely movable cores extending transversely of the longitudinal axis of the rail and coming together in lapped relation intermediate the aforesaid slider body and pull cavities, said cores being so mounted in the movable mold section as to be slidable in a direction longitudinal of the cores, and movable with the movable mold section in a direction laterally of the cores, and said cores being so shaped as to help form the posts, the space between the pivot pin and the slider body, the space between the pivot pin and the rail, the pivot pin, and the arms of the pull.

1%. A mold for molding a slider having a lug made up of two posts joined by a rail, and a pull made up of a handle having two arms joined by a pivot pin passing through the lug, said mold comprising a stationary mold section and a movable mold section, and being separable on a parting face extending transversely of the longitudinal axis of the slider and having appropriate cavities to form the slider body, the separable halves of the mold having fixed cores which help form a Y-shaped channel within the slider body, and also having cavities which help form the handle portion of the pull with the pull lying approximately in the parting face of the mold, said pull being turned about its longitudinal axis at an angle such that one arm of the pull lies on one side and the other arm of the pull lies on the other side of a plane extending transversely of the longitudinal axis of the slider, a pair of oppositely movable cores extending transversely of the longitudinal axis of the slider and coming together in lapped relation intermediate the aforesaid slider body and pull cavities, said cores being so mounted in the movable mold section as to be slidable in a direction longitudinal of the cores, and movable with the movable mold section in a direction laterally of the cores and said cores being so shaped as to help form the posts, the space between the pivot pin and the slider body,

the space between the pivot pin and the rail, the pivot pin, and the arms of the pull.

OTTO G. SCHEUERMANN. PAUL NATZLER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,010,313 Poncet Nov. 28, 1911 1,941,811 Morin Jan. 2, 1934 2,181,142 Marinsky Nov. 28, 1939 2,209,413 Marinsky July 30, 1940 2,266,887 McCoy Dec. 23, 1941 2,304,340 Dahlin Dec. 8, 1942 2,366,976 Martindell Jan. 9, 1945 2,388,986 Morin Nov. 13, 1945 2,415,395 Ulrich Feb. 4, 1947 

